Coal-screen



(NoMode1-) I W. F. DODGE & T. M. RIGHTER.

GOAL SCREEN.

No. 256,987: Patented Apr. 25, 1882;

WITNESSES: INVENTOR:

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I of uniform size, or nearly so.

UNITED STATES PATENT OFFICE.

WILLIAM F. DODGE, or WILKES-BARRE, AND TnoMAs M. R IeII'rER, OF sANDY RUN, PENNSYLVANIA.

COAL-SCREEN.

SPECIFICATION formingpart of Letters Patent No. 256,987, dated April 25, 1882,

Application filed December 10, 1881.. (No model.)

To all whom "it may concern Be it known that we, WILLIAM F. DODGE, of Wilkes-Barre, in the county of Luzerne and State of Pennsylvania, and THOMAS M. RIGHTER, of Sandy Run, in the county ot'Luzerne and State of Pennsylvania, have invented a new and useful Improvement in Goal Screens, of which the following is a full, clear, and exact description.

Our invention relates more particularly to the screens used with coal-breakers for sizing the coal, but can be used with advantage in all screens of large mesh.

The invention consists in a netting of novel form, as hereinafter described and claimed, intended to obviate the difficulty experienced by the slipping of the wires and the consequent irregularity of the openings, which, as is well-known, is a great cause of delay and expense to coal-miners.

Reference is to be had to the accompanying drawing, in which the invention is shown in the figure by a face view of a screen.

The screen is formed by wires or rods (1, attached to frame I). The frame is to be of any ordinary size and the wires of suitable diameter. The wires are continuous betweentwo opposite sides of the frame, which may be crosswise or lengthwise of the screen, and are bent in erenelated form, so that each wire is formed with a series of angular loops, 0, of the size'required for the opening in the completed screen. The several wires are put together to form the netting by engagement of the several loops 0, therebyformin g interspaces The wires being connected to the frame, there can be no slipping at the joints, and the screen will remain of uniform mesh under all ordinary treatment.

If desired, the wires may be crimped at the bends before the screen is put together, or by pressure applied to the completed screen, so that the wires shall retain their position at the interlooped angles, whether fastened to the frame or not, or the wires may be crimped at the angles, as shown in Fig. 2, to give a square form to the interspaces and prevent materials from wedging.

The screen of this construction is of superior excellence for use with coal-breakers, in which use the screens are made in curved segments to fit the revolving frame. We do not limit ourselves to that use, as the screen can be of any form desired and nsed for separation of other materials.

It will be seen that the meshes of the screen are arbitrarily formed by the loops of the wires, according as the wires are bent, and not by placing the wires a certain distance apart.

Having thus fully described our invention, we claim as new and desire to secure by Letters Patent- 1. The screen-netting formed of crenelated or looped wires interlocked, substantially as shown and described.

2. A screen having its meshes or in terspaces formed by interlocked loops of wires extending from one side to the opposite side of the frame, substantially as shown and described.

WILLIAM FRANK DODGE. THOMAS MONAIR RIGHTER. YVitnesses:

DANIEL HEIMBAOH, E. G. MARPLE. 

